A crowd clashed with federal agents after thousands of protesters marched through downtown Los Angeles as part of a national call to action following the fatal shootings of  Renee Good  and  Alex Pretti  in Minneapolis by federal immigration officers and the  surge in immigration operations  across the U.S. Demonstrators began gathering on Friday afternoon in front of LA City Hall, with crowds continuing to swell as protesters began marching. They filled some downtown streets and peacefully